<html>
    <head>
        <title>Polyfill demo - Cloudflare hosted with pinned version (but no integrity checking, since it is dynamically generated)</title>
        <script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0" crossorigin="anonymous"></script>
    </head>
    <body>
        ...
    </body>
</html>